Homeostasis
- Created by: nemoshea
- Created on: 28-04-13 13:56
View mindmap
- homeostasis
- blood sugar
- too high
- 1) detected by pancreas
- 2) insulin released
- 3) causes liver & cells to be permeable to glucose
- 4) glucose stored as glycogen
- too low
- 1) detected by pancreas
- 2) glucagon released
- 3) causes liver & cells to break down glycogen into glucose
- too high
- water & ions
- 1) blood goes into the kidneys
- 2) ultrafiltration: high pressure build up forcing water, ions & urea out of the blood through the membrane into bowman's capsule
- 3) selective reapsorbtion: in the nephron, the needed ions & water is reapsorbed bu diffusion. Glucose absorbed by active transport also
- 4) leftover substances end up in collecting duct then to bladder
- temperature
- too hot
- hairs lie flat
- sweat produced which evaporates from skin
- blood vessels near skin dilate (easier for heat to transfer)
- too cold
- hairs stand up (to try to trap an insulating layer or air)
- no sweat produced
- blood vessels near skin constrict
- start to shiver
- too hot
- blood sugar
Similar Biology resources:
Teacher recommended
Teacher recommended
Comments
No comments have yet been made